I have two monitors, and in Develop mode, I keep the Grid visible on the second monitor.
When I'm cropping, I like to use the second monitor for the crop preview, since the main monitor shows the grid overlay.
It would be convenient if Lightroom would automatically switch from Grid to Loupe view when I start a crop operation, and switch back to the previous view (Grid) once the crop is accepted.
I know I can press Shift+E to switch the second monitor to the Loupe View and Shift+G to switch back to the grid view. This is handy, but automatically switching (maybe with an option) would be even better.
This would save me the trouble of switching manually every time I want to crop an image.